year diff

Try this:

using System;

class Test

{

static void Main()

{

DateTime store = new DateTime(2005, 10, 5);

DateTime current = new DateTime(2012, 10, 4);

int yearDiff = GetYearDiff(store, current);

Console.WriteLine(yearDiff); // 7

Console.ReadKey();

}

static int GetYearDiff(DateTime dt1, DateTime dt2)

{

// express dates as days in an imaginary 372 day year with 12 x 31 day months

int d1 = dt1.Year * 372 + (dt1.Month - 1) * 12 + dt1.Day - 1;

dt2 = dt2.AddDays(1); // include last day in calculation

int d2 = dt2.Year * 372 + (dt2.Month - 1) * 12 + dt2.Day - 1;

return (d2 - d1)/372;

}